var addEvent=(function(window,document){if(document.addEventListener){return function(elem,type,callBack){if(elem&&!elem.length){elem.addEventListener(type,callBack,false)}else if(elem&&elem.length){len=elem.length;for(var i=0;i<len;i++){addEvent(elem[i],type,callBack)}}}}else if(document.attachEvent){return function(elem,type,callBack){if(elem&&!elem.length){elem.attachEvent('on'+type,function(){return callBack.call(elem)})}else if(elem&&elem.length){len=elem.length;for(var i=0;i<len;i++){addEvent(elem[i],type,callBack)}}}}})(this,document);